The dynamic adsorption performance of the cross-linked starch/acrylonitrile graft copolymer for copper ions in water

• The starch/acrylonitrile copolymer was used for dynamic adsorption of copper ions.
• The penetrating curve was fitted and its corresponding equation was y=y0+AeR0xy=y0+AeR0x.
• The optimal technical parameters for dynamic adsorption were discussed.
• The adsorption kinetics equation was established as q=(2.631c+0.535c2)τ(3.010c−2.003c2)q=(2.631c+0.535c2)τ(3.010c−2.003c2).

The graft copolymer of cross-linked starch/acrylonitrile was used for the dynamic adsorption of the copper ions in water and the experiments were carried out with the fixed bed. The penetration standard curve obtained by the fixed bed adsorption–penetration curve method was the S-type. An equation of y=y0+AeR0xy=y0+AeR0x which demonstrated the change of the concentration with the bed volume was fitted. The corresponding technical parameters such as flow rate, inlet ion concentration and the bed height were investigated to find the optimal adsorption conditions for the column. The results showed that with the flow rate was getting smaller, the inlet ion concentration, the bed height and the adsorption performance were getting lower, higher and better, respectively. However, the adsorption rate of the adsorbent became lower. Under ambient temperature the adsorption kinetics equation for the graft copolymer adsorbing copper ions in water was described as q=(86.9054c+41.9139c2)τ(1.3285−0.5716c)q=(86.9054c+41.9139c2)τ(1.3285−0.5716c).

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